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Tweaking an analog VU panel meter ?

Externet

Aug 24, 2009
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Aug 24, 2009
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891
Hi.
In a playing attempt to make a quick dirty solar pyranometer indicator, connected a plain garden light solar cell to a VU meter canibalized from defunct equipment, to see if would indicate something reasonable.

(-)Solar cell(+)----------------------/\/\/\/-------------------------(+)VUmeter(-)

The resistor is a variable 10K trimmer. I can set it to full scale at the clearest sunniest day. Fine. But how to set say a 50% insolation for center of scale ? With cloudy sky it already reaches beyond half scale; it should be less than half scale. The logarithmic reading is part of the meter or should be part of the circuitry driving it ?
Any clever passive trimming method ?
 
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